#include<stdio.h>
#include<unistd.h>
#include<sys/types.h>

int main()
{

  printf("process is running,only me!pid=%d\n",getpid());
  sleep(3);

  pid_t id=fork();
  if(id==-1)
    return 1;
  else if(id==0)
  {
    //child
    while(1)
    {
      printf("id:%d,I am child process!pid=%d,ppid=%d\n",id,getpid(),getppid());
      sleep(1);
    }
  }
  else 
  {
    //parent   
    printf("id:%d,I am parent process!pid=%d,ppid=%d\n",id,getpid(),getppid());
    sleep(2);
  }



//  printf("process is running,only me!\n");
//  sleep(3);
//
//  fork();
//  printf("hello world\n");
//  sleep(3);
//



//  while(1)
//  {
//    printf("hello world,pid=%d,ppid=%d\n",getpid(),getppid());
//    sleep(1);
//  }
//
  return 0;
}
